What a shame BE. Backing the engineer up here, you do seem to have been visited with one of our better ones, and in fairness to him he's TDR'd your line and probably seen something akin to a roller-coaster (or a Sine wave) on his HAWK measuring back to the PCP. He's then left his signalling kit on the line to make sure it appears in the PCP where his routing suggests it will be. Upon finding a 'double-jumpered' circuit, he (like I and any other decent engineer) would have probably been convinced that this was the fault repaired. He must have put the socket back together when returning back from the PCP, and he will have checked for dial tone. Obviously the crackle wasn't there when he did this.
Some might say he was wrong for not re-TDRing the line. I absolutely say he wouldn't have been expecting to. If you take a mains fed Radio to a repair shop with the plug hanging off, when the chap in the shop puts on a new plug would you have him perform diode,resistor, transistor, capacitor checks ?? Would you heck. You'd turn the radio on and when you hear music, you know it works. Same in this scenario, the engineer has found an absolutely blatant, hard & fast fault that WAS causing massive fault attenuation problems. He's repaired that and basically 'switched the radio back on' and got dial tone. Happy days. Who's to say he didn't carry out the 'Leg balance' test at the PCP that I mentioned earlier in the thread, which would also rule out the need for any further TDR tests ??
Anyhows, this tiny, very intemittent crackle that you get sounds like an E-side type noise. D-side faults tend to progressively get worse quite quickly, but E-sides are under constant air-pressure from the ECP racks in the exchange, in order to keep moisture at bay. It may be a drop in pressure (that can and does happen) that is causing the intermittency of this fault ?? Either way, it shouldn't affect the DLM in such a way as to keep your synch down at 22 Meg. By removing the double jumper your speed should go right back up.
@ razpag.I forgot to mention that I brought up the lack of another TDR test from my home when the 2nd engineer visited this afternoon.
He said that the 1st engineer had actually done a TDR test while he was down at the PCP & classed the line as clear.
Maybe that's what he meant when he said another TDR test wasn't needed from my home.
FYI, my IP Profile did increase to 21680 K for a short while after the 1st engineer left, but it is currently at only 12065 K.
I wish I could have seen the effect of of the removal of the double jumpering on my attenuation, as a comparison to when it was quite recently tested via the JDSU.
At the very least, I now know my actual Line Length & its route, which finally confirms beyond any doubt that I
should be able to achieve & sustain a sync rate of around 35 Mb (ish), with downloads a little lower than that.
The 1st engineer had a quick read through the notes & recommendations you had so kindly provided, verbally ticking them off as done, apart from the obvious broadband aspects, which he said he would haved loved to have done for me.
I wasn't knocking the efforts of the 1st engineer, I apologise if my post came across that way.
In fact I intended the complete opposite as he couldn't have been more helpful, keen to locate the fault, & informative.
Indeed the phone line was quiet when he left, my IP Profile had increased from when he first arrived, he had dealt with an obvious fault. What more could he have done, especially as the actual intermittent cause may well now prove to be elsewhere?
There probably isn't that much left to eliminate now..........is there?
I suppose that sometimes you are lucky & land on the cause at the outset & sometimes it is the very last thing in the elimination process.
Silly question time now:-The double jumpering couldn't possibly have been a previous well-meant effort to increase the poundage of my line to compensate for length, corrosion etc. could it? Is this ever done as a quick fix by BT, a bit like bonding 2 lines back in the old days to give a sync rate of was it 128K on dialup? (just trying to think laterally here - maybe I shouldn't!)
If so, could the removal of the double jumpering have actually increased my attenuation by leaving 800m or so of "loose end" if it was still connected somewhere near my home?
It does seem strange that my IP profile didn't shoot all the way up again & is now in fact much worse than it was this morning.
As we all know, there is absolutely no way that we users can obtain any information from the current BT modem. What a strange situation that is.
Paul.